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# Note 1 - Quiz Question Do you think the Skater will make it...

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1 1 Do you think the Skater will make it over the first hump? A. No. B. Yes. C. Depends on the friction on the track. Quiz Question 2 Do you think the Skater will make it over the first hump? A. No. B. Yes. C. Depends on the friction on the track. Quiz Question 3 Topic 1. Energy and work What’s energy model? Forms of energy Mechanical energy Conservation of energy Energy transfers • Work The effect of friction and air drag 4 What’s a Physics Model? R.W. Knight: “A model is a simplified description of reality…isolating the essential features, and developing a set of equations that provide an adequate, although not perfect description of reality.”

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2 5 What’s a Physics Model? 6 What’s a Physics Model? Electron Clouds 7 What’s energy model ? Forms of energy; Mechanical energy; Conservation of energy; Energy transfers; Work; Friction, air drag Knight: It’s like ‘natural money’ Example: Your household is the ‘system under consideration 8 What’s energy model? Forms of energy; Mechanical energy; Conservation of energy; Energy transfers; Work; Friction, air drag
3 9 What’s energy? Forms of energy ; Mechanical energy; Conservation of energy; Energy transfers; Work; Friction, air drag Some important forms of energy: Kinetic energy K Gravitational potential energy U g Elastic or spring potential energy U s Thermal energy E th Chemical energy E chem Nuclear energy E nucl Total energy E= K + U g + U s + E th + E chem + E nucl +… 10 What’s energy? Forms of energy; Mechanical energy ; Conservation of energy; Energy transfers; Work; Friction, air drag A moving object or person like the skater has kinetic energy , defined as K=mv 2 /2 Where v is the velocity of the object and m is its mass . Changing the kinetic energy of an object means changing its speed. 11 i>Clicker Question Two marbles, one twice as heavy as the other, are dropped to the ground from the same height. Just before hitting the ground, the heavier marble has (neglect air drag) A. as much kinetic energy as the lighter one.

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